another: adjust and prettify $fn calculations

1 files changed, 31 insertions, 30 deletions

diff --git a/another.scad b/another.scad
index 302e314..872ff33 100644
--- a/another.scad
+++ b/another.scad
@@ -58,12 +58,14 @@ module the_extruder(
  left=false,
  vitamins = true,
  supports = false,
  tensioner = true,
  debug = false
 ) {
+ fnd = 2*PI; fnr = 2*fnd;
+
  lever_shell = mount_screwhead_h+0.5;
  lever_thickness=max(spring_d+spring_d_clearance+layer_height*8,idler_h+idler_v_tolerance+2*lever_shell);
  lsd = idler_d-idler_clearance*2;
  longwing=gearbox_d/2+spring_d/2+lsd/2;
  h_ = (pulley_d+idler_d)/(2*sqrt(2));
  ri = sqrt( pow(h_,2) + pow(mount_d/2-h_,2) );
@@ -83,16 +85,16 @@ module the_extruder(
   children();
  }
  module finger_indent(d=lever_thickness,depth/*=1*/,r/*=15*/) {
   if(depth) {
    hh = (-4*pow(depth,2)+pow(d,2))/(8*depth);
    rr = depth+hh;
-   translate([0,0,hh]) sphere(r=rr,$fn=2*PI*rr);
+   translate([0,0,hh]) sphere(r=rr,$fn=fnr*rr);
   }else if(r) {
    hh=sqrt(pow(r,2)-pow(d,2)/4);
-   translate([0,0,hh]) sphere(r=r,$fn=2*PI*r);
+   translate([0,0,hh]) sphere(r=r,$fn=fnr*r);
   }
  }
 
  % if(vitamins) mirrorleft() {
   translate([0,0,-epsilon]) mirror([0,0,1]) cylinder(d=gearbox_d,h=1,$fn=60);
   for(zr=[0:90:359]) rotate([0,0,zr]) translate([mount_d/2,0,0])
@@ -155,26 +157,26 @@ module the_extruder(
       if(supports) for(y=[-lsd/2+extrusion_width:(lsd-2*extrusion_width)/3:lsd/2-extrusion_width])
        translate([-lsd/2-1,y-extrusion_width/2,-idler_h/2-idler_v_tolerance/2-1])
        cube(size=[lsd+2,extrusion_width,idler_h+idler_v_tolerance+2]);
      }
      cylinder(d=mount_screw_d+mount_screw_d_tolerance,h=lever_thickness+2,center=true,$fn=30);
      translate([0,0,lever_thickness/2-mount_screwhead_h]) 
-     cylinder(d=mount_screwhead_d,h=mount_screwhead_h+1,$fn=2*PI*mount_screwhead_d);
+     cylinder(d=mount_screwhead_d,h=mount_screwhead_h+1,$fn=fnd*mount_screwhead_d);
     }
     // mounting screw hole
     translate([mount_d/2,0,0])
-    cylinder(d=mount_screw_d+mount_screw_d_tolerance,h=lever_thickness+2,center=true,$fn=2*PI*mount_screw_d);
+    cylinder(d=mount_screw_d+mount_screw_d_tolerance,h=lever_thickness+2,center=true,$fn=fnd*mount_screw_d);
     
     // lever end
     translate([mount_d/2,0,0]) rotate([0,90,0]) {
      translate([0,-longwing,lsd/2]) finger_indent(d=lever_thickness-1,r=15);
      translate([0,-longwing,0])
      mirror([0,0,1])
      difference() {
-      cylinder(d=spring_d+spring_d_clearance,h=lsd,$fn=2*PI*spring_d);
-      sphere(d=spring_d*3/4,$fn=PI*spring_d);
+      cylinder(d=spring_d+spring_d_clearance,h=lsd,$fn=fnd*(spring_d+spring_d_clearance));
+      sphere(d=spring_d*3/4,$fn=fnd*spring_d*3/4);
      }
     }//rotate-translate
    }//difference
    // bridging patch
    place_idler()
    translate([0,0,lever_thickness/2-mount_screwhead_h])
@@ -183,21 +185,21 @@ module the_extruder(
   }//translate
  }//lever module
  
  module body() {
   difference() {
    union() {
-   cylinder(d=gearbox_d,h=body_h,$fn=2*PI*gearbox_d);
+   cylinder(d=gearbox_d,h=body_h,$fn=fnd*gearbox_d);
     // finger and spring support
     fsw = gearbox_d/2+mount_screwhead_d/2;
     translate([-gearbox_d/2,0,0]) difference() {
      union() {
       hull() {
        translate([0,-longwing,ls_z])
        rotate([0,90,0])
-       cylinder(d=max(lever_thickness,spring_d+spring_d_clearance+2*extrusion_width),h=fsw,$fn=2*PI*lever_thickness);
+       cylinder(d=lever_thickness,h=fsw,$fn=fnd*lever_thickness);
        hh=body_h-ls_z;
        translate([0,0,ls_z-lever_thickness/2])
        mirror([0,1,0]) cube(size=[fsw,longwing-hh+lever_thickness/sqrt(2),hh+lever_thickness/2]);
        hhh=ls_z;
        translate([0,0,0])
        mirror([0,1,0]) cube(size=[fsw,longwing-hhh+lever_thickness/sqrt(2),hhh+lever_thickness/2]);
@@ -208,20 +210,20 @@ module the_extruder(
        if(debug) translate([0,-gearbox_d,-gearbox_d]) cube(size=[body_h/2+1,gearbox_d,gearbox_d+2]);
        mirror([0,0,1]) {
         translate([0,0,st_shell])
         hull() for(o=[0,spring_d]) translate([0,-o,0])
         rotate([0,0,30])
         cylinder(d=st_nut_d,h=st_nut_h,$fn=6);
-        translate([0,0,-1]) cylinder(d=st_screw_d,h=fsw+2,$fn=st_screw_d*PI*2);
+        translate([0,0,-1]) cylinder(d=st_screw_d,h=fsw+2,$fn=fnd*st_screw_d);
         bigd = spring_d+spring_d_clearance;
         hf = (bigd-st_screw_d)/2;
         translate([0,0,st_shell+st_nut_h+st_shell-epsilon])
         cylinder(d1=st_screw_d,d2=bigd,
-         h=hf+epsilon, $fn=bigd*PI*2 );
+         h=hf+epsilon, $fn=fnd*bigd);
         translate([0,0,st_shell+st_nut_h+st_shell+hf-epsilon])
-        cylinder(d=bigd,h=fsw+1,$fn=bigd*PI*2);
+        cylinder(d=bigd,h=fsw+1,$fn=fnd*bigd);
        }
       }
      }
     } // translate
     
     // pushfit bracket
@@ -230,42 +232,42 @@ module the_extruder(
     rotate([-90,0,0])
     translate([0,0,mount_d/sqrt(2)/2+mount_screw_d-gearbox_d/2/*TODO:*/])
     cylinder(r=min(body_h-filament_elevation,filament_elevation)/sin(60)-epsilon,h=pf_h(pf)+gearbox_d/2/*TODO:*/,$fn=6);
    }//union (first child of difference)
    // protrusion
    translate([0,0,-1])
-   cylinder(d=protrusion_d+protrusion_tolerance_h,h=protrusion_h+protrusion_tolerance_v+1,$fn=2*PI*protrusion_d);
+   cylinder(d=protrusion_d+protrusion_tolerance_h,h=protrusion_h+protrusion_tolerance_v+1,$fn=fnd*(protrusion_d+protrusion_tolerance_h));
    // mount screw holes
    for(zr=[0:90:359]) rotate([0,0,zr]) translate([mount_d/2,0,0]) {
     translate([0,0,mount_screw_l-mounthole_depth/2-layer_height-1])
     mirror([0,0,1])
     cylinder(d=mount_screw_d+mount_screw_d_tolerance,
              h=mount_screw_l-mounthole_depth/2-layer_height+1,
-             $fn=2*PI*mount_screw_d);
+             $fn=fnd*(mount_screw_d+mount_screw_d_tolerance));
     translate([0,0,mount_screw_l-mounthole_depth/2])
-    cylinder(d=mount_screwhead_d,h=body_h+1,$fn=2*PI*mount_screwhead_d);
+    cylinder(d=mount_screwhead_d,h=body_h+1,$fn=fnd*mount_screwhead_d);
    }//for
    // pushfit
    translate([0,0,filament_elevation])
    rotate([0,0,45]) translate([pulley_d/2,0,0])
    rotate([-90,0,0])
    translate([0,0,mount_d/sqrt(2)/2+mount_screw_d+epsilon])
    rotate([0,0,180]) {
     pushfit(pf);
-    cylinder(d=filament_guide_d,h=gearbox_d,center=true,$fn=2*PI*filament_guide_d);
+    cylinder(d=filament_guide_d,h=gearbox_d,center=true,$fn=fnd*filament_guide_d);
     translate([0,-filament_guide_d/2/sqrt(2),0])
     rotate([0,0,45])
     cube(size=[filament_guide_d/2,filament_guide_d/2,gearbox_d],center=true);
    }
    // pulley
-   cylinder(d=pulley_d+pulley_clearance,h=body_h+1,$fn=2*PI*(pulley_d+pulley_clearance));
+   cylinder(d=pulley_d+pulley_clearance,h=body_h+1,$fn=fnd*(pulley_d+pulley_clearance));
    // leverspace
    hull() for(x=[0,gearbox_d])
    rotate([0,0,45])
    translate([x,0,ls_z-ls_h/2])
-   cylinder(d=idler_d+idler_clearance,h=ls_h,$fn=2*PI*idler_d);
+   cylinder(d=idler_d+idler_clearance,h=ls_h,$fn=fnd*(idler_d+idler_clearance));
    
    a=cos(45)*(pulley_d+idler_d)/2;
    b=mount_d/2-a;
    x=sqrt(pow(a,2)+pow(b,2));
    translate([mount_d/2,0,ls_z])
    intersection() {
@@ -282,24 +284,23 @@ module the_extruder(
     mirror([0,1,0])
     cube(size=[gearbox_d,gearbox_d/2+1,lever_thickness+lever_v_clearance]);
    }
    //translate([-mount_d/2,-longwing,filament_elevation])
    if(!tensioner) translate([mount_d/2,-longwing,filament_elevation])
    rotate([0,-90,0]) difference() {
-    cylinder(d=spring_d+spring_d_clearance,h=spring_lc+spring_dl,$fn=PI*spring_d);
-    translate([0,0,spring_lc+spring_dl]) sphere(d=spring_d*3/4,$fn=PI*spring_d);
-   }
+    cylinder(d=spring_d+spring_d_clearance,h=spring_lc+spring_dl,$fn=fnd*(spring_d+spring_d_clearance));
+    translate([0,0,spring_lc+spring_dl]) sphere(d=spring_d*3/4,$fn=fnd*spring_d*3/4);
    }
     
   }//difference
 
   if(supports) intersection() {
    difference() {
     translate([0,0,ls_z-ls_h/2-epsilon])
-    cylinder(d=gearbox_d,h=ls_h+2*epsilon,$fn=2*PI*gearbox_d);
-    cylinder(d=pulley_d+pulley_clearance,h=body_h+1,$fn=2*PI*(pulley_d+pulley_clearance));
+    cylinder(d=gearbox_d,h=ls_h+2*epsilon,$fn=fnd*gearbox_d);
+    cylinder(d=pulley_d+pulley_clearance,h=body_h+1,$fn=fnd*(pulley_d+pulley_clearance));
    }
    // supports
    // TODO: hardcoded stuff below…
    if(false) { // parallel
     for(y=[-gearbox_d:4:gearbox_d])
      translate([0,y-extrusion_width/2,0])
@@ -317,45 +318,45 @@ module the_extruder(
   smalld=st_screw_d+2*extrusion_width;
   bigd = spring_d+spring_d_clearance/2;
   hf = (bigd-smalld)/2;
   translate([-gearbox_d/2+st_shell+st_nut_h+st_shell+smalld,-longwing,filament_elevation])
   rotate([0,90,0]) difference() {
    union() {
-    cylinder(d1=smalld,d2=bigd,h=hf,$fn=bigd*PI*2);
+    cylinder(d1=smalld,d2=bigd,h=hf,$fn=fnd*bigd);
     translate([0,0,hf-epsilon])
-    cylinder(d=bigd,h=hf*2,$fn=bigd*PI*2);
+    cylinder(d=bigd,h=hf*2,$fn=fnd*bigd);
    }
    translate([0,0,-epsilon])
-   cylinder(d=st_screw_d,h=2*hf+epsilon,$fn=st_screw_d*PI*2);
+   cylinder(d=st_screw_d,h=2*hf+epsilon,$fn=fnd*st_screw_d);
   }
  }
 
  module knob() {
   ch = knob_indent_d/2;
   translate([0,0,body_h+epsilon]) {
    mirror([0,0,1]) translate([0,0,-epsilon]) {
     difference() {
-     cylinder(d=pulley_d,h=knob_bore_l,$fn=pulley_d*PI*2);
+     cylinder(d=pulley_d,h=knob_bore_l,$fn=fnd*pulley_d);
      translate([0,0,-1]) difference() {
       cylinder(d=bore_d+knob_bore_d_tolerance,h=knob_bore_l+2);
       translate([-bore_d/2-1,bore_dd-bore_d/2+knob_bore_d_tolerance/2,-1])
       cube([bore_d+2,bore_d/2,knob_bore_l+4]);
      }
     }
    }
    difference() {
     union() {
-     cylinder(d1=gearbox_d-2*ch,d2=gearbox_d,h=ch+epsilon,$fn=PI*gearbox_d*2);
+     cylinder(d1=gearbox_d-2*ch,d2=gearbox_d,h=ch+epsilon,$fn=fnd*gearbox_d);
      translate([0,0,ch])
-     cylinder(d=gearbox_d,h=knob_h-2*ch+epsilon,$fn=PI*gearbox_d*2);
+     cylinder(d=gearbox_d,h=knob_h-2*ch+epsilon,$fn=fnd*gearbox_d);
      translate([0,0,knob_h-ch])
-     cylinder(d1=gearbox_d,d2=gearbox_d-2*ch,h=ch,$fn=PI*gearbox_d*2);
+     cylinder(d1=gearbox_d,d2=gearbox_d-2*ch,h=ch,$fn=fnd*gearbox_d);
     }
     for(a=[0:360/knob_indents:359]) rotate([0,0,a])
      translate([0,gearbox_d/2,-1])
-     cylinder(d=knob_indent_d,h=knob_h+2,$fn=knob_indent_d*PI*2);
+     cylinder(d=knob_indent_d,h=knob_h+2,$fn=fnd*knob_indent_d);
    }
   }
  }//knob module
 
  mirrorleft()
  if(what=="lever") color("green",0.7) lever();